We have a TCL tv. Not plasma or LCD. Watching it then the picture reduced to a fine horizontal line through th middle. Sound is fine. What does this mean?
That is a vertical deflection circuit problem. try to check a 470 UF capacitor connected to the vert. yoke coil if it is open or try resoldering the nconnecrtion at the board. if not, try to replace the B+ filter of the vertical amplifier. another is try to chexk if the vertical moscillator is qworking if you know elecrtonics.
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